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Related Concept Videos

Alkali Metals03:06

Alkali Metals

24.3K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.3K
Biological Effects of Radiation02:59

Biological Effects of Radiation

17.7K
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.2K
Metallic Solids02:37

Metallic Solids

20.5K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
20.5K
Radiation: Applications01:17

Radiation: Applications

1.7K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
1.7K
Absorption of Radiation01:05

Absorption of Radiation

1.2K
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
1.2K

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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Terahertz Radiation from Combined Metallic Slit Arrays.

Dazhi Li1,2, Makoto Nakajima3, Masahiko Tani4

  • 1Institute for Laser Technology, Osaka, 5650871, Japan. dazhi_li@hotmail.com.

Scientific Reports
|May 4, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for efficient terahertz radiation generation using a dual metallic slit array structure. This approach shows promise for developing advanced terahertz sources.

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Area of Science:

  • Physics
  • Electromagnetism
  • Materials Science

Background:

  • Terahertz (THz) radiation generation is crucial for various scientific and technological applications.
  • Existing THz sources often face limitations in efficiency, directionality, or performance.
  • Periodic structures offer potential for novel electromagnetic wave manipulation.

Purpose of the Study:

  • To propose and investigate an efficient approach for generating terahertz radiation.
  • To explore the electromagnetic properties of a combined periodic structure for radiation generation.
  • To demonstrate the potential for developing high-performance terahertz sources.

Main Methods:

  • Designing a combined periodic structure with two metallic slit arrays.
  • Varying parameters like periodic length, slit width, and depth of the arrays.
  • Analyzing the electromagnetic modes supported by the structure.
  • Simulating the resonant interaction between an electron beam and these modes.

Main Results:

  • The combined slit arrays exhibit unique electromagnetic modes with nonradiative and radiative properties.
  • These modes enable efficient resonant interaction with an electron beam.
  • Strong and directional electromagnetic radiation in the terahertz regime is generated.

Conclusions:

  • The proposed dual metallic slit array configuration is an effective method for terahertz radiation generation.
  • The unique electromagnetic modes are key to achieving efficient and directional THz output.
  • This approach holds significant potential for the development of next-generation terahertz sources.